Most good IPs will not recommend an IVA to you if you could afford to pay your debts in full over say a five or six year period, but Andrew makes a good point about affordability. Do make sure that you come up with a monthly figure which you really believe you can pay, and then see what options there are for you.
If you have no assets, also bear in mind that bankruptcy proceedings are also available to you, albeit morally you may feel better off repaying your creditors.
Regards, Melanie Giles, Insolvency Practitioner for over 20 years.
To have me propose an IVA for you, please visit:
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http://www.iva.com/iva_companies/IVA_Advice_Bureau.asp